OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) + 4*a(n-3) + 5*a(n-4) - 5*a(n-5) - 2*a(n-6).
Empirical g.f.: x*(48 + 43*x + 165*x^2 + 109*x^3 - 205*x^4 - 64*x^5) / (1 - x - 4*x^3 - 5*x^4 + 5*x^5 + 2*x^6). - Colin Barker, Dec 28 2018
EXAMPLE
Some solutions for n=4:
..1..1..0....0..0..1....0..1..1....1..1..1....0..0..1....0..1..1....0..0..0
..1..0..0....0..1..1....0..0..0....0..0..0....0..1..1....0..0..0....0..0..0
..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..1..1
..0..0..0....0..0..0....0..1..0....1..0..0....0..0..0....0..0..1....0..0..1
..0..0..1....0..1..1....0..1..0....0..0..0....0..0..1....0..1..1....0..0..0
..0..1..1....0..1..1....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 14 2015
STATUS
approved